Transactions of the Japan Society of Mechanical Engineers

Refrigeration and Air-Conditioning

Hideo UCHIDA

1959 Volume 25 Issue 157 Pages 913-915
Published: September 25, 1959
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.25.913

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Flow Across a Cylinder with Hemispherical Head

Mikio ARIE, Sei-ichi IIDA

1959 Volume 25 Issue 157 Pages 916-919
Published: September 25, 1959
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.25.916

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Since a theoretical treatment of the flow around a body with an arbitrary shape is usually difficult, only some of simple cases have been solved. In this paper, it is shown that a uniform flow around a body can be treated theoretically by an analysis of the combined flow of distributed three-dimensional doublets and uniform flow, so far as the body is of an axisymmetrical shape and does not have any sudden change on its surface. As an example, a clew of determining the position of static holes of a Pitot-static tube is also given by applying the analysis to the flow around a cylinder with hemispherical head. The analytical results obtained are compared with the combined flow of a three-dimensional source and uniform flow and also with an experimental result reported by Ower and Johansen.

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An Approximate Theory of Airfoil Cascade in Subsonic Flow

Goro KAMIMOTO, Shuji ISHIDA, Teruaki AKAMATSU

1959 Volume 25 Issue 157 Pages 920-927
Published: September 25, 1959
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.25.920

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This paper deals with an approximate theory of airfoil cascades in subsonic flow. The theory is developed by the so-called "Interference Method" and the Prandtl-Glauert's approximate theory of airfoil in subsonic flow. The calculated results of some airfoil cascades coincide well with the ones calculated by the "Hodograph Method". The Inverse Problem is also discussed in this paper.

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Study on the Uniform-Flow Manifold

Yuji SATO

1959 Volume 25 Issue 157 Pages 927-937
Published: September 25, 1959
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.25.927

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From viewpoint of designning manifold system which distributes or concentrates fluid uniformly, practical method of calculations are given. Starting from theoretical model, brief equations for energy loss and pressure distribution as well as a criterion for judging behaviour of pressure distribution curves are introduced, by use of which required total pressure and pressure distribution are easily calculated. As for the coefficients in the equations, experimental researches were made for many types of branching, including ports. These data and methods were utilized for the design of air ducts in Kanmon Vehicular tunnel ventilation system. Some of the measurement data of the tunnel system are referred to.

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On the Additional Loss at the Entry of a Pipe in the Case of Non-Newtonian Laminar Flow

Yukio TOMITA

1959 Volume 25 Issue 157 Pages 938-942
Published: September 25, 1959
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.25.938

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Prof. Iwanami has minutely made the experimental and theoretical studies on the additional loss at the entry of a pipe, through which Newtonian fluid flows slowly. However, on the theoretical treatment of the additional loss at the entry in the case of non-Newtonian laminar flow, no attempt has ever been undertaken by anyone, as far as the author's knowledge is concerned. Assuming the velocity distributions so as to satisfy the boundary conditions and the equation of continuity, and treating this problem from the standpoint of energy dissipation, the author found the relation between the rheological constant and the equivalent length of additional loss at the entry of a pipe.

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Research on the Characteristics of Regenerative Pump : 1st Report, Influences of Flow Channel and Impeller

Minoru SHIMOSAKA, Shinzo YAMAZAKI

1959 Volume 25 Issue 157 Pages 943-950
Published: September 25, 1959
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.25.943

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The authors carried out the experiments on a regenerative pump systematically, changing the dimensions of flow channels, impellers and clearances. And they propose a "characteristic dimension of flow channel" for a parameter. Then the following results are obtained through above experiments. (1) The influence of the clearances on the pump performance depends on the characteristic dimension of flow channel. The allowable clearance is decided by the value of the characteristic dimension of flow channel. (2) The pump efficiency is high in the adequate range of impeller and characteristic dimension of flow channel. (3) The influence of number of vanes on the pump performance depends on the width ratio of vane. (4) The pump performance depends on the combinations of characteristic dimension of flow channel, width ratio, thickness and length of vane. (5) The upper and lower limits of characteristic dimension of flow channel are fixed by the values of clearance and dimension of impeller.

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Research on the Characteristics of Regenerative Pump : 2nd Report, Theoretical Performance

Minoru SHIMOSAKA

1959 Volume 25 Issue 157 Pages 951-959
Published: September 25, 1959
Released on J-STAGE: March 28, 2008

DOIhttps://doi.org/10.1299/kikai1938.25.951

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According to the author's preceding research on regenerative pump, in which the flow channel and the impeller dimensions were widely changed, the pump performance is influenced by their relations. Then, it is obvious that the analysis of performance can not be considered without taking their relations into account, when they vary with each other. The author's analysis is considered their effects on the theoretical performance. And he shows that the theoretical performance is available for the practical purpose.

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